@SciAstro

Former lead for Science at NASA (Associate Administrator) Astronaut STS-67,81,103,109,125 Hubble Hugger, Space and Earth explorer

go.nasa.gov/johngrunsfeld
Joined February 2012
  • Tweets848
  • Following224
  • Followers26.8K
214Media
John Grunsfeld retweeted
NASA Watch
@NASAWatch29 Oct 2024
FYI Greg Autry @GregWAutry at @UCF @UCFBusiness @ucfspacebiz really wants to be the next @NASA Administrator. With #Project2025 & the #ScheduleF loyalty test how many people at #NASA will be defined in the same way? Is this any way to explore space? No. xitter.cf/GregWAutry/status/1849…
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It's one of the most intriguing locations for understanding the possibilities of extraterrestrial life. Learn more about why Jupiter's moon Europa fascinates scientists and explorers: europa.nasa.gov/why-europa/o…
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Voting is an important way to shape the future of our country and have your voice heard. Register to vote at GoVoteColorado.gov
Illustration of votes exercising near the capitol steps.

ALT Illustration of votes exercising near the capitol steps.

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Many of us in the space industry, from scientists and engineers, astronauts and Star Trek actors, and more will be speaking tomorrow night for @space4harris. Join me along with @BillNye, @RobertPicardo, @TheGalacticGal, @Laur_Ly, and others as we share our vision for where space exploration and realms of study (like astrobiology) can go with @KamalaHarris and @Tim_Walz as our next U.S. President and VP.
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John Grunsfeld retweeted
John Grunsfeld@SciAstro13 Aug 2024
Please join the Space Cadets 4 Harris call this Thursday, August 15th. spacecadets4harris.com/
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John Grunsfeld retweeted
Hubble
@NASAHubble1 Nov 2022
Twice the telescopes = twice as iconic 🤩 Take in these views from Hubble and @NASAWebb, all featuring the star-forming region known as the Pillars of Creation. Both telescopes see in different wavelengths of light, so working together, we get a broader view of these pillars!
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John Grunsfeld retweeted
NASA Watch
@NASAWatch7 Mar 2022
Can we just fast forward to the part where the Vulcans arrive and save our butts? #StarTrek #Ukraine
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.@Battelle, which manages the U.S. @NSF's National Ecological Observatory Network (NEON) program, is using SpaceX's Starlink satellite internet in a pilot test to deliver data from a rural area in Colorado to scientists studying ecosystems: battelle.org/insights/newsro…
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John Grunsfeld retweeted
Mashable
@mashable1 Mar 2022
All aboard! ⛵

Michelin’s inflatable sail can power boats without fuel

Michelin debuted a project called "WISAMO." It's an inflatable sail that can be used on ships to reduce carbon emissions.

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Congrats to the team! @NASAWebb is now in its new stable home in space & one step closer to helping us #UnfoldTheUniverse. This orbit will allow a wide view of the cosmos at any given moment. I'm so excited to see what's uncovered as Webb begins to send images back this summer.
NASA Webb Telescope
@NASAWebb24 Jan 2022
🏠 Home, home on Lagrange! We successfully completed our burn to start #NASAWebb on its orbit of the 2nd Lagrange point (L2), about a million miles (1.5 million km) from Earth. It will orbit the Sun, in line with Earth, as it orbits L2. blogs.nasa.gov/webb/2022/01/… #UnfoldTheUniverse

Animation: Webb Pan Past at L2 Point

This animation illustrates the location of Webb's destination, the second Lagrange point: It shows Earth in the mid-ground, and the Sun in the background.

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Replying to @NASAWatch
Love that pic @NASAWatch! I am looking for the pic, but I met a 23yo man from northern England who braved several international Covid protocols and challenges and came to the @NASAWebb launch in Kourou. His name: James Webb! – at North Snyderville Basin, UT
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And here we see the last view of #Webb as it separated from @ariane5 and started it's month-long journey to L2 🤩 #WebbFliesAriane #WebbSeesFarther
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What a parting shot. Solar array deployment as #JWST heads to its new home beyond the moon.
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John Grunsfeld retweeted
Eric Berger
@SciGuySpace25 Dec 2021
For most space science missions, the majority of "risk" is retired after the launch. With the James Webb Space Telescope, only about 10 percent of the mission risk has now been retired.
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The main engines of Webb’s @Ariane5 rocket have cut off, and the main stage has now separated. The upper stage has ignited and will burn for about 16 minutes. At cutoff, Webb will be moving 25,000 miles per hour (relative to Earth)! #UnfoldTheUniverse go.nasa.gov/3qs9Kp5
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John Grunsfeld retweeted
NASA Watch
@NASAWatch25 Dec 2021
Main Engine Cut Off and stage separation and second stage ignition for #Webb #NASAWebb
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View of part of the folded sun shield post-fairing jettison. Trajectory is nominal, all going smoothly so far! #JWST
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Today I will share two photos: one taken on the day I joined Univ. of Chicago in 1981. The person with brown blazer directly below my picture is Dr. J. Grunsfeld @SciAstro who spent 58d in space. He repaired HST. JWST starts a new era but HST will remain in our heart for ever.
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Merry Christmas launch day! 🤩🎄🚀 #WebbFliesAriane #Webb #JWST #VA256
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UPDATE: @NASA, @ESA, and @Arianespace have confirmed a targeted launch date of Dec. 25 at 7:20 am ET (12:20 UTC) for the James Webb Space Telescope. The @Ariane5 rocket is set to roll out to the launchpad on Dec. 23: go.nasa.gov/3mrw7dc
A mockup of Arianespace's Ariane 5 rocket is seen at the entrance to the Guiana Space Center in Kourou, French Guiana, Tuesday, Dec. 21, 2021.

ALT A mockup of Arianespace's Ariane 5 rocket is seen at the entrance to the Guiana Space Center in Kourou, French Guiana, Tuesday, Dec. 21, 2021.

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